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v3.25.2

BENEFIT PLANS: (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 USD ($) plan | Jun. 30, 2024 USD ($)
Benefit plans |  |
Number of noncontributory defined benefit pension plans | plan | 2 |
Defined contribution plan and post-retirement defined benefit plans |  |
Defined benefit plan, net periodic benefit costs |  |
Service cost | $ 1.2 | $ 1.3
Interest cost | 1.9 | 2.0
Expected return on plan assets | (3.6) | (3.2)
Amortization of prior service cost/ (credit) | 0.1 | 0.2
Amortization of net loss/(gain) | 0.1 |
Net periodic (benefit) cost | (0.3) | 0.3
Post-retirement health care plans |  |
Defined benefit plan, net periodic benefit costs |  |
Interest cost | 1.0 | 1.1
Net periodic (benefit) cost | $ 1.0 | $ 1.1

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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